cifs: truncate fallout

Remove the calls to inode_newsize_ok given that we already did it as
part of inode_change_ok in the beginning of cifs_setattr_(no)unix.

No need to call ->truncate if cifs doesn't have one, so remove the
explicit call in cifs_vmtruncate, and replace the calls to vmtruncate
with truncate_setsize which is vmtruncate minus inode_newsize_ok
and the call to ->truncate.

Rename cifs_vmtruncate to cifs_setsize to match the new calling conventions.

Question 1:  why does cifs do the pagecache munging and i_size update twice
	for each setattr call, once opencoded in cifs_vmtruncate, and once
	using the VFS helpers?
Question 2: what is supposed to be protected by i_lock in cifs_vmtruncate?
	Do we need it around the call to inode_change_ok?

[AV: fixed build breakage]

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 7 insertions, 23 deletions

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index b95f4a5af013..ddbe8a84c51d 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1679,26 +1679,16 @@ static int cifs_truncate_page(struct address_space *mapping, loff_t from)
         return rc;
 }
 
-static int cifs_vmtruncate(struct inode *inode, loff_t offset)
+static void cifs_setsize(struct inode *inode, loff_t offset)
 {
         loff_t oldsize;
-        int err;
 
         spin_lock(&inode->i_lock);
-        err = inode_newsize_ok(inode, offset);
-        if (err) {
-                spin_unlock(&inode->i_lock);
-                goto out;
-        }
-
         oldsize = inode->i_size;
         i_size_write(inode, offset);
         spin_unlock(&inode->i_lock);
+
         truncate_pagecache(inode, oldsize, offset);
-        if (inode->i_op->truncate)
-                inode->i_op->truncate(inode);
-out:
-        return err;
 }
 
 static int
@@ -1771,7 +1761,7 @@ cifs_set_file_size(struct inode *inode, struct iattr *attrs,
 
         if (rc == 0) {
                 cifsInode->server_eof = attrs->ia_size;
-                rc = cifs_vmtruncate(inode, attrs->ia_size);
+                cifs_setsize(inode, attrs->ia_size);
                 cifs_truncate_page(inode->i_mapping, inode->i_size);
         }
 
@@ -1891,11 +1881,8 @@ cifs_setattr_unix(struct dentry *direntry, struct iattr *attrs)
                 goto out;
 
         if ((attrs->ia_valid & ATTR_SIZE) &&
-            attrs->ia_size != i_size_read(inode)) {
-                rc = vmtruncate(inode, attrs->ia_size);
-                if (rc)
-                        goto out;
-        }
+            attrs->ia_size != i_size_read(inode))
+                truncate_setsize(inode, attrs->ia_size);
 
         setattr_copy(inode, attrs);
         mark_inode_dirty(inode);
@@ -2050,11 +2037,8 @@ cifs_setattr_nounix(struct dentry *direntry, struct iattr *attrs)
                 goto cifs_setattr_exit;
 
         if ((attrs->ia_valid & ATTR_SIZE) &&
-            attrs->ia_size != i_size_read(inode)) {
-                rc = vmtruncate(inode, attrs->ia_size);
-                if (rc)
-                        goto cifs_setattr_exit;
-        }
+            attrs->ia_size != i_size_read(inode))
+                truncate_setsize(inode, attrs->ia_size);
 
         setattr_copy(inode, attrs);
         mark_inode_dirty(inode);